Acura 2014 TL Owner's Manual page 528

Blind Spot Information System (BSI)
ALERT INDICATOR
LEVER
ILLUMINATE
BLINK
The BSI alert indicator starts to blink
as a reminder if you move the turn
signal lever in the direction of the
detected vehicle.
522
Radar sensors, located underneath
each corner of the rear bumper,
detect objects. Do not cover this area
with labels or stickers of any kind.
Always keep this area free of any
kind of dirt every time you get in the
vehicle.
Impacts to the radar sensors or the
area around them can affect system
performance. If an impact occurs,
have the system checked by your
dealer.